2 answers:
Answer:
<h2>6√2</h2>
Step-by-step explanation:
ΔEBD and ΔEDC are similar. Therefore the sides are in proportion:
We have:
DE = a
EB = 18
EC = 4
Substitute:
<em>cross multiply</em>
Answer:
a^2 = 18 * 4
a^2 = 72
a = 6√2
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